Book Image

React and React Native - Third Edition

By : Adam Boduch, Roy Derks
Book Image

React and React Native - Third Edition

By: Adam Boduch, Roy Derks

Overview of this book

React and React Native, Facebook’s innovative User Interface (UI) libraries, are designed to help you build robust cross-platform web and mobile applications. This updated third edition is improved and updated to cover the latest version of React. The book particularly focuses on the latest developments in the React ecosystem, such as modern Hook implementations, code splitting using lazy components and Suspense, user interface framework components using Material-UI, and Apollo. In terms of React Native, the book has been updated to version 0.62 and demonstrates how to apply native UI components for your existing mobile apps using NativeBase. You will begin by learning about the essential building blocks of React components. Next, you’ll progress to working with higher-level functionalities in application development, before putting this knowledge to use by developing user interface components for the web and for native platforms. In the concluding chapters, you’ll learn how to bring your application together with a robust data architecture. By the end of this book, you’ll be able to build React applications for the web and React Native applications for multiple mobile platforms.
Table of Contents (33 chapters)
Section 1: React
Section 2: React Native
Section 3: React Architecture

Displaying data using lists

The NativeBase List component is useful when you have a large array of objects that you want to render. The ListItem components can also be selected by the user. Let's look at an example. First, we'll add some states for items that we want to render as a list on the screen:

const [items, setItems] = useState(
new Array(100)
.map((value, index) => ({ name: `Item ${index + 1}`, selected: false }))

The items state is an array of objects with a name to display, and a selected Boolean property that defaults to false. Next, we'll define a helper function that returns an event handler for the list item at a given index, which toggles the selected value:

function toggleSelected(index) {
return () => {
const newItems = [...items];
const item = { ...items[index], selected: !items[index].selected };

newItems[index] = item;


Once the selected property is updated, we can use the setItems() function...